Refactored version directory names

3.0 and 2.0 do not work, there are multiple versions and anything with a period in it sucks from my point of view, v2 and v3 feel much better from a DX perspective.

datamodel/low/v3/callback_test.go

@@ -0,0 +1,113 @@
+// Copyright 2022 Princess B33f Heavy Industries / Dave Shanley
+// SPDX-License-Identifier: MIT
+
+package v3
+
+import (
+	"github.com/pb33f/libopenapi/datamodel/low"
+	"github.com/pb33f/libopenapi/index"
+	"github.com/stretchr/testify/assert"
+	"gopkg.in/yaml.v3"
+	"testing"
+)
+
+func TestCallback_Build_Success(t *testing.T) {
+
+	yml := `'{$request.query.queryUrl}':
+    post:
+      requestBody:
+        description: Callback payload
+        content: 
+          'application/json':
+            schema:
+              type: string
+      responses:
+        '200':
+          description: callback successfully processed`
+
+	var rootNode yaml.Node
+	mErr := yaml.Unmarshal([]byte(yml), &rootNode)
+	assert.NoError(t, mErr)
+
+	var n Callback
+	err := low.BuildModel(rootNode.Content[0], &n)
+	assert.NoError(t, err)
+
+	err = n.Build(rootNode.Content[0], nil)
+	assert.NoError(t, err)
+
+	assert.Len(t, n.Expression.Value, 1)
+
+}
+
+func TestCallback_Build_Error(t *testing.T) {
+
+	// first we need an index.
+	doc := `components:
+  schemas:
+    Something:
+      description: this is something
+      type: string`
+
+	var idxNode yaml.Node
+	mErr := yaml.Unmarshal([]byte(doc), &idxNode)
+	assert.NoError(t, mErr)
+	idx := index.NewSpecIndex(&idxNode)
+
+	yml := `'{$request.query.queryUrl}':
+  post:
+    $ref: #/does/not/exist/and/invalid`
+
+	var rootNode yaml.Node
+	mErr = yaml.Unmarshal([]byte(yml), &rootNode)
+	assert.NoError(t, mErr)
+
+	var n Callback
+	err := low.BuildModel(rootNode.Content[0], &n)
+	assert.NoError(t, err)
+
+	err = n.Build(rootNode.Content[0], idx)
+	assert.Error(t, err)
+
+}
+
+func TestCallback_Build_Using_InlineRef(t *testing.T) {
+
+	// first we need an index.
+	doc := `components:
+  schemas:
+    Something:
+      description: this is something
+      type: string`
+
+	var idxNode yaml.Node
+	mErr := yaml.Unmarshal([]byte(doc), &idxNode)
+	assert.NoError(t, mErr)
+	idx := index.NewSpecIndex(&idxNode)
+
+	yml := `'{$request.query.queryUrl}':
+    post:
+      requestBody:
+        $ref: '#/components/schemas/Something'
+      responses:
+        '200':
+          description: callback successfully processed`
+
+	var rootNode yaml.Node
+	mErr = yaml.Unmarshal([]byte(yml), &rootNode)
+	assert.NoError(t, mErr)
+
+	var n Callback
+	err := low.BuildModel(rootNode.Content[0], &n)
+	assert.NoError(t, err)
+
+	err = n.Build(rootNode.Content[0], idx)
+	assert.NoError(t, err)
+	assert.Len(t, n.Expression.Value, 1)
+
+	exp := n.FindExpression("{$request.query.queryUrl}")
+	assert.NotNil(t, exp.Value)
+	assert.NotNil(t, exp.Value.Post.Value)
+	assert.Equal(t, "this is something", exp.Value.Post.Value.RequestBody.Value.Description.Value)
+
+}